n. [ OE. goules, F. gueules, the same word as gueule throat, OF. gole, goule, L. gula. So named from the red color of the throat. See Gullet, and cf. Gula. ] (Her.) The tincture red, indicated in seals and engraved figures of escutcheons by parallel vertical lines. Hence, used poetically for a red color or that which is red. [ 1913 Webster ]

His sev'n-fold targe a field of gules did stain
In which two swords he bore; his word,
“Divide and reign.” P. Fletcher. [ 1913 Webster ]

Follow thy drum;
With man's blood paint the ground; gules, gules. Shak. [ 1913 Webster ]

Let's march to rest and set in gules, like suns. Beau. & Fl. [ 1913 Webster ]